Rotary digging-machine



`A.m1|sH/\USER. ROTARY DIGGING MACHINE.

APPLxcA'Tlo man APR. a, 1920.

Patented July 5, 192i.

E i i awe/MW? therefore to the hoes connected to the latter. At the ends lll restingagainst the ring 2,the arms oit the hoes inclose partially the pins 13 securedv to the-inner plates The end lelo the aiin of a hoe projects between pin 13 and ring- 2 and is of sach a shape that after unscrewing bolt 6 the arrn of the hoe can easily beren/loved when a small turning motion of the arni around pin 13 is executed. i

rllhe working edge o't each flat arni is ci convex curvature and fitted at the end projecting,` beyond the innerplates d with a hoe 17 beveled its sides and standing bach in relation with the curved edge.

Preferably the driving axle l is provided with a plurality oi spit rer-lilr-e unitsiiorined by the hoes and airanged on the axle, each nnit consisting ol three hoes connected to the plates in the manner shown in Figs. l, 2 and 3. Advantageonsly the arms ot the adjacent units are turned against each other. The separate units are threaded on the drivingl axle spaced by bushings 15 and then pressed together by nuts 16, the ring;- 2 havingr such a thickness that sulicient clearance is provided to allow an unrestricted movement of the inner plates el inside the enter plates The ring 2 serves atethersaine time to center the inner plates fi.

A great advantage of the di,g'ginp ,1 apparatus shown consists in the tact that all three circular springs 8 taire part simultaneously in producing the momentary resiliency el any single working' hoe. This eirciunstance allows ci using single circular springs of comparatively srnall dimensions and of placing' them near the driving; axle 1. The great advantage results thereof that the lengths of the arins of the hoes used for active worlr are considerably7 increased. The fastening` oi the hoes gives a goed ratiov between the length of the iixed part and the free'part of thc hoe arms on which their lateral elasticity depends. increased lateral elasticity of the hoes is of great iniportance when stones or other objects cans-A ing a considerable resistance are struck by the hoes.

Iclaim:

l. ln' a rotary digging unit, the combination of a driving axle, a pair of plates spaced apart and fixed on said axle, a second pair of plates centered on said axle arranged be: tween and connected to the first pair by a resilient connection. and a plurality of hoes the arms of which are arranged between the second Apair of plates.

'2, ln a rotary digging nnit, the combination of a driving axle et profiled section, a pair of plates spaced apart and fixed on said axle, a spacing ring xed to the axle, a second pair of platee centered on said ring between 'the Erst pair of plates and alresilient connection between the ot piates and messer hoes, the list arms of.' w "lich are arranged betvif'een the second pair of plates.

3. ln a rotary digging unit, the combination of a driving,r axle, a pair of plates spaced apart and i'ixed on said axle, a second pair plates centeredon said axle and arranged between the first pair of plates, a resilient connection between the pairs of plates, a ring,` on said axle, and hoes having arms which are arranged between said second: pair of plates and detachably connected thereto, the inner end of said arms resting against said, ring, and a pin secured to the lirst pair o plates against which said arms bear. .A l.

l. ln a rotary digging unit, the combination ot a driving axle, a pair of plates spaced apart and Fixed on said axle, a second pair of plates centered on said axle arranged between. the rst pair of plates, a resilient con`- nection between the pairs of plates, and hoes having arins which are arranged between said second pair of plates and detachably connected thereto, the working edge'of said arins being convex. t

. ln a rot-ary digging machine, the coinbination of a driving axle, a pair oit platesP spaced. apart and fixed on axle, a second pair ot plates centered on and loose on said axle, arranged between the lirst pair of plates, a resilient connection between the pairs of plates, and hoes having arms which are arranged between said second pair of plates and detachably connected thereto, the working edge of the arms being convex .and arranged in advance of the hoes.

6. ln a rotary digging unit, the combination ot a driving' axle, a pair of plates spaced apart and fixed to' said axle, a second pair of plates centered and loose on said axle arranged between said first pair of plates, circular holes provided in both pairs of plates, circular springs inserted in said holes and acting` as resilient connections between the two pairs of plates, and hoes having arms which are arranged between the second pair..

of plates and detachably connected' thereto,

7. ln a rotary digging machine, the cobination of a driving axle, a .pair of plates spaced apart and fixed to said axle, a second pair of plates loose on said axle arranged between the first pair ot plates, a resilientconnection between said pairs of pla-tes, hoes having flat arms which are arranged between said second pair of Aplates and detachably connected thereto, the aforementioned parts torrningu a. digging unit on the axle, a plurality oi' such units arranged on the axle, and spacing bushings between said units.

8. 'in rotary digging machine, the con1- bination of a driving axle, a'pair of plates spaced apart and fixed to said axle, a second pair of plates loose on. said axle arranged between the irst pair of plates, a resilient connection between the pairs orf plates, hoes having fied.: which are a'ngd between Said second of paes and detachably connected there-i0, :md :1. ring for Si ming the plates of the rst pni: imm an@ zmoiw iwan extent sufcent, to plovda 'dile www sary deman@ for a swinging movemni; @if the second pair of pintas. bat-W991i and wiatvely to the first pa?.

in a rotary gging unit, a shaft? a pail' Gf plates rigidly seclu'ei herebo a secon paul of plates bewaen the plates @if the s, pau* and loose wlh respect t@ sind Shaft,

chggng arms seemed boween the Miter pa? and eirculii sN ing through boh pairs `of plaies.

n testimony that' daim h, foegong as my invention, have signed my fname.

ARNGLD RUTSHAUSER. 

